Least positive integer k for which 7^n divides k!.

Terms

a(0) =1a(1) =7a(2) =14a(3) =21a(4) =28a(5) =35a(6) =42a(7) =49a(8) =49a(9) =56a(10) =63a(11) =70a(12) =77a(13) =84a(14) =91a(15) =98a(16) =98a(17) =105a(18) =112a(19) =119a(20) =126a(21) =133a(22) =140a(23) =147a(24) =147a(25) =154a(26) =161a(27) =168a(28) =175a(29) =182